The earliest record of a Sumerian creation myth, called The Eridu Genesis by historian Thorkild Jacobsen, is found on a single fragmentary tablet excavated in Nippur by the Expedition of the University of Pennsylvania in 1893, and first recognized by Arno Poebel in 1912. It is written in the Sumerian language and dated to around 1600 BCE. Other Sumerian creation myths from around this date are called the Barton Cylinder, the Debate between sheep and grain and the Debate between Winter and Summer, also found at Nippur.